Being suckers for anything flatpack, we love Portland designer Nathan Chrislip's Ribcage and Heart card.
He writes in Etsy: "This is an original valentine of my own design. Original artwork is printed on both sides of the heart." Only nine bucks, too bad I left it to the last minute.
The New York Times photo of it is rather more dramatic.
Available for nine bucks via Etsy
More ideas for Valentines Day in TreeHugger:
Valentine's Day Gifts: Green Love for Everyone